摘要:
An object of the invention is to provide a solid polyaluminoxane composition suitably used as a cocatalyst and a catalyst carrier in combination with an olefin oligomerization or polymerization catalyst, without the use of solid inorganic carriers such as silica. The solid polyaluminoxane composition of the invention includes a polyalkylaluminoxane and a trialkylaluminum, and has a solubility in n-hexane at 25° C. of less than 0.50 mol % as measured by a specific method (i), a solubility in toluene at 25° C. of less than 1.0 mol % as measured by a specific method (ii), and a 13 mol % or more molar fraction of alkyl groups derived from the trialkylaluminum moieties relative to the total number of moles of alkyl groups derived from the polyalkylaluminoxane moieties and the alkyl groups derived from the trialkylaluminum moieties as measured with respect to tetrahydrofuran-d8 soluble components by a specific method (iii).
摘要:
A modified solid polyalkylaluminoxane is provided, which is capable of providing α-olefin suppressing adhesion of any polymer produced as a by-product onto the reactor wall and the stirrer, and which is capable of providing a highly active olefin oligomerization reaction catalyst. An olefin oligomerization reaction catalyst containing the modified solid polyalkylaluminoxane is also provided. The modified solid polyalkylaluminoxane for olefin oligomerization reactions contains structural units represented by general formula (a) and structural units represented by general formula (b), whose median diameter is equal to or larger than 0.1 μm and equal to or smaller than 50 μm, in which R′ in the general formula (a) represents an alkyl group having 1 to 20 carbon atoms, and R″ in the general formula (b) represents a halogenated alkoxy group having 1 to 20 carbon atoms or a halogenated aryloxy group having 6 to 20 carbon atoms.
摘要:
Disclosed are transition metal or group II metal ester polymers where the metal is an alkaline earth, transition metal or aluminum; methods of manufacture, and uses thereof. The metal ester polymers exhibit both high dielectric constant and low conductivity suitable for use as dielectric insulating materials.
摘要:
An object of the invention is to provide a solid polyaluminoxane composition suitably used as a cocatalyst and a catalyst carrier in combination with an olefin oligomerization or polymerization catalyst, without the use of solid inorganic carriers such as silica. The solid polyaluminoxane composition of the invention includes a polyalkylaluminoxane and a trialkylaluminum, and has a solubility in n-hexane at 25° C. of less than 0.50 mol % as measured by a specific method (i), a solubility in toluene at 25° C. of less than 1.0 mol % as measured by a specific method (ii), and a 13 mol % or more molar fraction of alkyl groups derived from the trialkylaluminum moieties relative to the total number of moles of alkyl groups derived from the polyalkylaluminoxane moieties and the alkyl groups derived from the trialkylaluminum moieties as measured with respect to tetrahydrofuran-d8 soluble components by a specific method (iii).
摘要:
Novel chain polymers comprising weakly basic anionic moieties chemically bound into a polyether backbone at controllable anionic separations are presented. Preferred polymers comprise orthoborate anions capped with dibasic acid residues, preferably oxalato or malonato acid residues. The conductivity of these polymers is found to be high relative to that of most conventional salt-in-polymer electrolytes. The conductivity at high temperatures and wide electrochemical window make these materials especially suitable as electrolytes for rechargeable lithium batteries.
摘要:
The present invention relates generally to a method of synthesising a metal alkoxide polymer involving the following general steps: 1. acidolysis; 2. condensation; and 3. subsequent processing. The acidolysis step is preferably performed without addition of water, in the presence of a mutual solvent. The acidolysis step involves acidolysis of a metal alkoxide compound with an acid to produce an intermediate acidolysed solution. The condensation step involves condensation of the intermediate solution in the presence of a metal alkoxide compound to produce the metal alkoxide polymer.
摘要:
Novel chain polymers comprising weakly basic anionic moieties chemically bound into a polyether backbone at controllable anionic separations are presented. Preferred polymers comprise orthoborate anions capped with dibasic acid residues, preferably oxalato or malonato acid residues. The conductivity of these polymers is found to be high relative to that of most conventional salt-in-polymer electrolytes. The conductivity at high temperatures and wide electrochemical window make these materials especially suitable as electrolytes for rechargeable lithium batteries.
摘要:
A process for producing an alumina-based fiber, which involves mixing an aluminum compound represented by the general formula AIR.sub.1 R.sub.2 R.sub.3 (wherein R.sub.1 R.sub.2 and R.sub.3 are each an organic group or a halogen) with water in a molar ratio of ([H.sub.2 O]/[AIR.sub.1 R.sub.2 R.sub.3 ]) of 1.10 to 1.40 to produce a polyaluminoxane, mixing the polyaluminoxane with at least one silicon-containing compound in an amount such that desired alumina-based fiber has, after calcining, a silica content of up to 70%, spinning the resulting mixture of polyaluminoxane and silicon-containing compound under an atmosphere controlled at a temperature of above 28.degree. C. and a relative humidity of above 35% to obtain precursor fiber, and then calcinating the precursor fiber to obtain an alumina-based fiber.
摘要:
A novel polymetalosilazane having a metal/silicon atomic ratio of from 0.001 to 3 and a number average molecular weight of about 200 to 500,000 is prepared by a process comprising: reacting a polysilazane having a number average molecular weight of about 100 to 500,000, which has a skelton consisting substantially of units ##STR1## at least one R being hydrogen, with a metal alkoxide in which the metal is selected from metals of the groups IIA and III to V of the Periodic Table.
摘要:
In a first stage, a heterocyclic oxygen compound is polymerized by an ionic route in a vinyl halide and, in a second stage, the vinyl halide, to which other unsaturated monomers capable of being polymerized by a radical route may be added if desired, is polymerized by a radical route in aqueous dispersion and in the presence of the polymerization mixture originating from the first stage.